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hv: hypercall: add support to change guest page write permission

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Add hcall_change_vm_page_wp_perm to change guest one page write permission.

Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Li, Fei1
2018-07-24 10:51:54 +08:00
committed by lijinxia
parent efd5ac4814
commit 34c6862a28
4 changed files with 91 additions and 0 deletions
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54
hypervisor/common/hypercall.c
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@@ -558,6 +558,60 @@ int32_t hcall_set_vm_memory_regions(struct vm *vm, uint64_t param)
return 0;
}
static int32_t write_protect_page(struct vm *vm, struct wp_data *wp)
{
uint64_t hpa, base_paddr;
uint64_t prot_set;
uint64_t prot_clr;
hpa = gpa2hpa(vm, wp->gpa);
dev_dbg(ACRN_DBG_HYCALL, "[vm%d] gpa=0x%x hpa=0x%x",
vm->attr.id, wp->gpa, hpa);
base_paddr = get_hv_image_base();
if (((hpa <= base_paddr) && (hpa + CPU_PAGE_SIZE > base_paddr)) ||
((hpa >= base_paddr) &&
(hpa < base_paddr + CONFIG_RAM_SIZE))) {
pr_err("%s: overlap the HV memory region.", __func__);
return -EINVAL;
}
prot_set = (wp->set != 0U) ? 0UL : EPT_WR;
prot_clr = (wp->set != 0U) ? EPT_WR : 0UL;
return ept_mr_modify(vm, (uint64_t *)vm->arch_vm.nworld_eptp,
wp->gpa, CPU_PAGE_SIZE, prot_set, prot_clr);
}
int32_t hcall_write_protect_page(struct vm *vm, uint16_t vmid, uint64_t wp_gpa)
{
struct wp_data wp;
struct vm *target_vm = get_vm_from_vmid(vmid);
if ((vm == NULL) || (target_vm == NULL)) {
return -EINVAL;
}
if (!is_vm0(vm)) {
pr_err("%s: Not coming from service vm", __func__);
return -EPERM;
}
if (is_vm0(target_vm)) {
pr_err("%s: Targeting to service vm", __func__);
return -EINVAL;
}
(void)memset((void *)&wp, 0U, sizeof(wp));
if (copy_from_gpa(vm, &wp, wp_gpa, sizeof(wp)) != 0) {
pr_err("%s: Unable copy param to vm\n", __func__);
return -EFAULT;
}
return write_protect_page(target_vm, &wp);
}
int32_t hcall_remap_pci_msix(struct vm *vm, uint16_t vmid, uint64_t param)
{
int32_t ret = 0;